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10W LED Driver

I need to understand the 10w led driver circuit shown in image.

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    \$\begingroup\$ what do you mean by understand ? ..... that is a horrible schematic, by the way .... where did that come from? \$\endgroup\$ – jsotola Nov 1 '18 at 6:52
  • \$\begingroup\$ I got that from web, I am unable to understand that why npn transistor is used there? \$\endgroup\$ – Shreedhar Katwe Nov 1 '18 at 7:42
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    \$\begingroup\$ it looks like someone on the internet just adjusted things until they got the result they wanted. They could have got the same result with a single resistor \$\endgroup\$ – Jasen Nov 1 '18 at 8:51
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This is the same schematic.

Which part do you not understand?

schematic

simulate this circuit – Schematic created using CircuitLab

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    \$\begingroup\$ +1 for taking the trouble to re-draw the circuit in a proper form, this is how it should have been drawn in the question. Anyway: it's a pointless schematic. One power-resistor can do the same job as Q1, R2, R1. There is no need for L1 and C1 isn't really needed either. Also this is a very inefficient way to power a 10 W LED from 12 V. \$\endgroup\$ – Bimpelrekkie Nov 1 '18 at 7:16

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